Alumina vs. Zinc Selenide
Alumina belongs to the oxide-based engineering ceramics classification, while zinc selenide belongs to the non-glass optical ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.
For each property being compared, the top bar is alumina and the bottom bar is zinc selenide.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 5.3 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 69 |
| Melting Onset (Solidus), °C | 2040 | |
| 1520 |
| Poisson's Ratio | 0.22 to 0.24 | |
| 0.28 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 340 |
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 7.3 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 26 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 17 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 9.5 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 7.3 |